Battery controller of vehicle

A battery controller of a vehicle comprises:

• an internal combustion engine;
• a generator that generates electricity by driving of the internal combustion engine;
• a battery charged by an electric power generated by the generator;
• a battery state detector that detects a battery state including a remaining capacity of the battery;
• a degree-of-deterioration determination unit that determines a degree of deterioration of the battery based on the battery state detected by the battery state detector;
• a neglect state detector that detects a neglect state of the vehicle;
• a monitoring time setting unit that sets a monitoring time to monitor the remaining capacity based on the degree of deterioration determined by the degree-of-deterioration determination unit and a current remaining capacity of the battery detected by the battery state detector when the neglect state of the vehicle is detected by the neglect state detector;
• and
• a charging necessity determination unit that determines whether or not the battery needs to be charged after the monitoring time set by the monitoring time setting unit passes,
• wherein charging of the battery by the generator is started when the charging necessity determination unit determines that the battery needs to be charged.